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|
/*
SSSD
IPA Backend Module -- selinux loading
Authors:
Jan Zeleny <jzeleny@redhat.com>
Copyright (C) 2012 Red Hat
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <security/pam_modules.h>
#include "db/sysdb_selinux.h"
#include "util/sss_selinux.h"
#include "providers/ldap/sdap_async.h"
#include "providers/ipa/ipa_common.h"
#include "providers/ipa/ipa_config.h"
#include "providers/ipa/ipa_selinux.h"
#include "providers/ipa/ipa_hosts.h"
#include "providers/ipa/ipa_hbac_rules.h"
#include "providers/ipa/ipa_hbac_private.h"
#include "providers/ipa/ipa_access.h"
#include "providers/ipa/ipa_selinux_common.h"
#include "providers/ipa/ipa_selinux_maps.h"
#include "providers/ipa/ipa_subdomains.h"
#if defined HAVE_SELINUX && defined HAVE_SELINUX_LOGIN_DIR
#include <selinux/selinux.h>
static struct tevent_req *
ipa_get_selinux_send(TALLOC_CTX *mem_ctx,
struct be_ctx *be_ctx,
struct sysdb_attrs *user,
struct sysdb_attrs *host,
struct ipa_selinux_ctx *selinux_ctx);
static errno_t ipa_get_selinux_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
size_t *count,
struct sysdb_attrs ***maps,
size_t *hbac_count,
struct sysdb_attrs ***hbac_rules,
char **default_user,
char **map_order);
static struct ipa_selinux_op_ctx *
ipa_selinux_create_op_ctx(TALLOC_CTX *mem_ctx, struct sysdb_ctx *sysdb,
struct sss_domain_info *domain,
struct be_req *be_req, const char *username,
const char *hostname,
struct ipa_selinux_ctx *selinux_ctx);
static void ipa_selinux_handler_done(struct tevent_req *subreq);
static void ipa_get_selinux_connect_done(struct tevent_req *subreq);
static void ipa_get_selinux_hosts_done(struct tevent_req *subreq);
static void ipa_get_config_step(struct tevent_req *req);
static void ipa_get_selinux_config_done(struct tevent_req *subreq);
static void ipa_get_selinux_maps_done(struct tevent_req *subreq);
static void ipa_get_selinux_hbac_done(struct tevent_req *subreq);
static errno_t ipa_selinux_process_maps(TALLOC_CTX *mem_ctx,
struct sysdb_attrs *user,
struct sysdb_attrs *host,
struct sysdb_attrs **selinux_maps,
size_t selinux_map_count,
struct sysdb_attrs **hbac_rules,
size_t hbac_rule_count,
struct sysdb_attrs ***usermaps);
struct ipa_selinux_op_ctx {
struct be_req *be_req;
struct sss_domain_info *domain;
struct ipa_selinux_ctx *selinux_ctx;
struct sysdb_attrs *user;
struct sysdb_attrs *host;
};
void ipa_selinux_handler(struct be_req *be_req)
{
struct be_ctx *be_ctx = be_req_get_be_ctx(be_req);
struct ipa_selinux_ctx *selinux_ctx;
struct ipa_selinux_op_ctx *op_ctx;
struct tevent_req *req;
struct pam_data *pd;
const char *hostname;
struct sss_domain_info *user_domain;
struct be_ctx *subdom_be_ctx;
pd = talloc_get_type(be_req_get_data(be_req), struct pam_data);
selinux_ctx = talloc_get_type(be_ctx->bet_info[BET_SELINUX].pvt_bet_data,
struct ipa_selinux_ctx);
hostname = dp_opt_get_string(selinux_ctx->id_ctx->ipa_options->basic,
IPA_HOSTNAME);
if (!hostname) {
DEBUG(SSSDBG_OP_FAILURE, ("Cannot determine this machine's host name\n"));
goto fail;
}
if (strcasecmp(pd->domain, be_ctx->domain->name) != 0) {
subdom_be_ctx = ipa_get_subdomains_be_ctx(be_ctx);
if (subdom_be_ctx == NULL) {
DEBUG(SSSDBG_OP_FAILURE, ("Subdomains are not configured, " \
"cannot lookup domain [%s].\n",
pd->domain));
goto fail;
} else {
user_domain = find_subdomain_by_name(subdom_be_ctx->domain,
pd->domain, true);
if (user_domain == NULL) {
DEBUG(SSSDBG_MINOR_FAILURE, ("No domain entry found " \
"for [%s].\n", pd->domain));
goto fail;
}
}
} else {
user_domain = be_ctx->domain;
}
op_ctx = ipa_selinux_create_op_ctx(be_req, user_domain->sysdb,
user_domain,
be_req, pd->user, hostname,
selinux_ctx);
if (op_ctx == NULL) {
DEBUG(SSSDBG_OP_FAILURE, ("Cannot create op context\n"));
goto fail;
}
req = ipa_get_selinux_send(be_req, be_ctx,
op_ctx->user, op_ctx->host, selinux_ctx);
if (req == NULL) {
DEBUG(SSSDBG_OP_FAILURE, ("Cannot initiate the search\n"));
goto fail;
}
tevent_req_set_callback(req, ipa_selinux_handler_done, op_ctx);
return;
fail:
be_req_terminate(be_req, DP_ERR_FATAL, PAM_SYSTEM_ERR, NULL);
}
static struct ipa_selinux_op_ctx *
ipa_selinux_create_op_ctx(TALLOC_CTX *mem_ctx, struct sysdb_ctx *sysdb,
struct sss_domain_info *domain,
struct be_req *be_req, const char *username,
const char *hostname,
struct ipa_selinux_ctx *selinux_ctx)
{
struct ipa_selinux_op_ctx *op_ctx;
struct ldb_dn *host_dn;
const char *attrs[] = { SYSDB_ORIG_DN,
SYSDB_ORIG_MEMBEROF,
NULL };
size_t count;
struct ldb_message **msgs;
struct sysdb_attrs **hosts;
errno_t ret;
op_ctx = talloc_zero(mem_ctx, struct ipa_selinux_op_ctx);
if (op_ctx == NULL) {
return NULL;
}
op_ctx->be_req = be_req;
op_ctx->domain = domain;
op_ctx->selinux_ctx = selinux_ctx;
ret = sss_selinux_extract_user(op_ctx, sysdb, domain, username, &op_ctx->user);
if (ret != EOK) {
goto fail;
}
host_dn = sysdb_custom_dn(sysdb, op_ctx, domain, hostname, HBAC_HOSTS_SUBDIR);
if (host_dn == NULL) {
goto fail;
}
/* Look up the host to get its originalMemberOf entries */
ret = sysdb_search_entry(op_ctx, sysdb, host_dn,
LDB_SCOPE_BASE, NULL,
attrs, &count, &msgs);
if (ret == ENOENT || count == 0) {
op_ctx->host = NULL;
return op_ctx;
} else if (ret != EOK) {
goto fail;
} else if (count > 1) {
DEBUG(SSSDBG_OP_FAILURE, ("More than one result for a BASE search!\n"));
goto fail;
}
ret = sysdb_msg2attrs(op_ctx, count, msgs, &hosts);
talloc_free(msgs);
if (ret != EOK) {
goto fail;
}
op_ctx->host = hosts[0];
return op_ctx;
fail:
talloc_free(op_ctx);
return NULL;
}
static errno_t create_order_array(TALLOC_CTX *mem_ctx, const char *map_order,
char ***_order_array, size_t *_order_count);
static errno_t choose_best_seuser(struct sysdb_attrs **usermaps,
struct pam_data *pd,
char **order_array, int order_count,
const char *default_user);
static void ipa_selinux_handler_done(struct tevent_req *req)
{
struct ipa_selinux_op_ctx *op_ctx = tevent_req_callback_data(req, struct ipa_selinux_op_ctx);
struct be_req *breq = op_ctx->be_req;
struct be_ctx *be_ctx = be_req_get_be_ctx(breq);
struct sysdb_ctx *sysdb = op_ctx->domain->sysdb;
errno_t ret, sret;
size_t map_count = 0;
struct sysdb_attrs **maps = NULL;
bool in_transaction = false;
char *default_user = NULL;
struct pam_data *pd =
talloc_get_type(be_req_get_data(breq), struct pam_data);
char *map_order = NULL;
size_t hbac_count = 0;
struct sysdb_attrs **hbac_rules = 0;
struct sysdb_attrs **best_match_maps;
size_t order_count;
char **order_array;
ret = ipa_get_selinux_recv(req, breq, &map_count, &maps,
&hbac_count, &hbac_rules,
&default_user, &map_order);
if (ret != EOK) {
goto fail;
}
/* Process the maps and return list of best matches (maps with
* highest priority). The input maps are also parent memory
* context for the output list of best matches. The best match
* maps should never be freed explicitly but always through
* their parent (or any indirect parent) */
ret = ipa_selinux_process_maps(maps, op_ctx->user, op_ctx->host,
maps, map_count,
hbac_rules, hbac_count, &best_match_maps);
if (ret != EOK) {
goto fail;
}
ret = create_order_array(op_ctx, map_order,
&order_array, &order_count);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Failed to create ordered SELinux users array.\n"));
goto fail;
}
ret = choose_best_seuser(best_match_maps, pd, order_array, order_count,
default_user);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Failed to evaluate ordered SELinux users array.\n"));
goto fail;
}
ret = sysdb_transaction_start(sysdb);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to start transaction\n"));
goto fail;
}
in_transaction = true;
ret = sysdb_delete_usermaps(op_ctx->domain->sysdb, op_ctx->domain);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Cannot delete existing maps from sysdb\n"));
goto fail;
}
ret = sysdb_store_selinux_config(sysdb, op_ctx->domain,
default_user, map_order);
if (ret != EOK) {
goto fail;
}
if (map_count > 0 && maps != NULL) {
ret = ipa_save_user_maps(sysdb, op_ctx->domain, map_count, maps);
if (ret != EOK) {
goto fail;
}
}
ret = sysdb_transaction_commit(sysdb);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("Could not commit transaction\n"));
goto fail;
}
in_transaction = false;
/* If we got here in online mode, set last_update to current time */
if (!be_is_offline(be_ctx)) {
op_ctx->selinux_ctx->last_update = time(NULL);
}
pd->pam_status = PAM_SUCCESS;
be_req_terminate(breq, DP_ERR_OK, EOK, "Success");
return;
fail:
if (in_transaction) {
sret = sysdb_transaction_cancel(sysdb);
if (sret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("Could not cancel transaction\n"));
}
}
if (ret == EAGAIN) {
be_req_terminate(breq, DP_ERR_OFFLINE, EAGAIN, "Offline");
} else {
be_req_terminate(breq, DP_ERR_FATAL, ret, NULL);
}
}
static errno_t
ipa_selinux_process_seealso_maps(struct sysdb_attrs *user,
struct sysdb_attrs *host,
struct sysdb_attrs **seealso_rules,
size_t seealso_rules_count,
struct sysdb_attrs **hbac_rules,
size_t hbac_rule_count,
uint32_t top_priority,
struct sysdb_attrs **usermaps,
size_t best_match_maps_cnt);
static errno_t
ipa_selinux_process_maps(TALLOC_CTX *mem_ctx,
struct sysdb_attrs *user,
struct sysdb_attrs *host,
struct sysdb_attrs **selinux_maps,
size_t selinux_map_count,
struct sysdb_attrs **hbac_rules,
size_t hbac_rule_count,
struct sysdb_attrs ***_usermaps)
{
TALLOC_CTX *tmp_ctx;
int i;
errno_t ret;
uint32_t priority = 0;
uint32_t top_priority = 0;
struct sysdb_attrs **seealso_rules;
size_t num_seealso_rules = 0;
const char *seealso_str;
struct sysdb_attrs **usermaps;
size_t best_match_maps_cnt = 0;
tmp_ctx = talloc_new(NULL);
if (!tmp_ctx) {
return ENOMEM;
}
seealso_rules = talloc_zero_array(tmp_ctx, struct sysdb_attrs *,
selinux_map_count + 1);
if (seealso_rules == NULL) {
ret = ENOMEM;
goto done;
}
usermaps = talloc_zero_array(tmp_ctx, struct sysdb_attrs *, selinux_map_count + 1);
if (usermaps == NULL) {
ret = ENOMEM;
goto done;
}
for (i = 0; i < selinux_map_count; i++) {
if (sss_selinux_match(selinux_maps[i], user, host, &priority)) {
if (priority < top_priority) {
/* This rule has lower priority than what we already have,
* skip it. */
continue;
} else if (priority > top_priority) {
/* This rule has higher priority, drop what we already have */
while (best_match_maps_cnt > 0) {
best_match_maps_cnt--;
usermaps[best_match_maps_cnt] = NULL;
}
top_priority = priority;
}
usermaps[best_match_maps_cnt] = selinux_maps[i];
best_match_maps_cnt++;
continue;
}
/* SELinux map did not matched -> check sealso attribute for
* possible HBAC match */
ret = sysdb_attrs_get_string(selinux_maps[i],
SYSDB_SELINUX_SEEALSO, &seealso_str);
if (ret == ENOENT) {
continue;
} else if (ret != EOK) {
goto done;
}
seealso_rules[num_seealso_rules] = selinux_maps[i];
num_seealso_rules++;
}
ret = ipa_selinux_process_seealso_maps(user, host,
seealso_rules, num_seealso_rules,
hbac_rules, hbac_rule_count,
top_priority, usermaps, best_match_maps_cnt);
if (ret != EOK) {
goto done;
}
*_usermaps = talloc_steal(mem_ctx, usermaps);
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
static errno_t
ipa_selinux_process_seealso_maps(struct sysdb_attrs *user,
struct sysdb_attrs *host,
struct sysdb_attrs **seealso_rules,
size_t seealso_rules_count,
struct sysdb_attrs **hbac_rules,
size_t hbac_rule_count,
uint32_t top_priority,
struct sysdb_attrs **usermaps,
size_t best_match_maps_cnt)
{
int i, j;
errno_t ret;
struct ldb_message_element *el;
struct sysdb_attrs *usermap;
const char *seealso_dn;
const char *hbac_dn;
uint32_t priority;
for (i = 0; i < hbac_rule_count; i++) {
ret = sysdb_attrs_get_string(hbac_rules[i], SYSDB_ORIG_DN, &hbac_dn);
if (ret != EOK) {
return ret;
}
/* We need to do this translation for further processing. We have to
* do it manually because no map was used to retrieve HBAC rules.
*/
ret = sysdb_attrs_get_el(hbac_rules[i], IPA_MEMBER_HOST, &el);
if (ret != EOK) return ret;
el->name = SYSDB_ORIG_MEMBER_HOST;
ret = sysdb_attrs_get_el(hbac_rules[i], IPA_MEMBER_USER, &el);
if (ret != EOK) return ret;
el->name = SYSDB_ORIG_MEMBER_USER;
DEBUG(SSSDBG_TRACE_ALL,
("Matching HBAC rule %s with SELinux mappings\n", hbac_dn));
if (!sss_selinux_match(hbac_rules[i], user, host, &priority)) {
DEBUG(SSSDBG_TRACE_ALL, ("Rule did not match\n"));
continue;
}
/* HBAC rule matched, find if it is in the "possible" list */
for (j = 0; j < seealso_rules_count; j++) {
usermap = seealso_rules[j];
if (usermap == NULL) {
continue;
}
ret = sysdb_attrs_get_string(usermap, SYSDB_SELINUX_SEEALSO, &seealso_dn);
if (ret != EOK) {
return ret;
}
if (strcasecmp(hbac_dn, seealso_dn) == 0) {
DEBUG(SSSDBG_TRACE_FUNC, ("HBAC rule [%s] matched, copying its"
"attributes to SELinux user map [%s]\n",
hbac_dn, seealso_dn));
/* Selinux maps priority evaluation removed --DELETE this comment before pushing*/
if (priority < top_priority) {
/* This rule has lower priority than what we already have,
* skip it. */
continue;
} else if (priority > top_priority) {
/* This rule has higher priority, drop what we already have */
while (best_match_maps_cnt > 0) {
best_match_maps_cnt--;
usermaps[best_match_maps_cnt] = NULL;
}
top_priority = priority;
}
usermaps[best_match_maps_cnt] = usermap;
best_match_maps_cnt++;
ret = sysdb_attrs_copy_values(hbac_rules[i], usermap, SYSDB_ORIG_MEMBER_USER);
if (ret != EOK) {
return ret;
}
ret = sysdb_attrs_copy_values(hbac_rules[i], usermap, SYSDB_USER_CATEGORY);
if (ret != EOK) {
return ret;
}
/* Speed up the next iteration */
seealso_rules[j] = NULL;
}
}
}
return EOK;
}
static errno_t create_order_array(TALLOC_CTX *mem_ctx, const char *map_order,
char ***_order_array, size_t *_order_count)
{
TALLOC_CTX *tmp_ctx;
char *order = NULL;
char **order_array;
errno_t ret;
int i;
int len;
size_t order_count;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
ret = ENOMEM;
goto done;
}
order = talloc_strdup(tmp_ctx, map_order);
if (order == NULL) {
ret = ENOMEM;
goto done;
}
len = strlen(order);
/* The "order" string contains one or more SELinux user records
* separated by $. Now we need to create an array of string from
* this one string. First find out how many elements in the array
* will be. This way only one alloc will be necessary for the array
*/
order_count = 1;
for (i = 0; i < len; i++) {
if (order[i] == '$') order_count++;
}
order_array = talloc_array(tmp_ctx, char *, order_count);
if (order_array == NULL) {
ret = ENOMEM;
goto done;
}
/* Now fill the array with pointers to the original string. Also
* use binary zeros to make multiple string out of the one.
*/
order_array[0] = order;
order_count = 1;
for (i = 0; i < len; i++) {
if (order[i] == '$') {
order[i] = '\0';
order_array[order_count] = &order[i+1];
order_count++;
}
}
*_order_array = talloc_steal(mem_ctx, order_array);
*_order_count = order_count;
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
static errno_t write_selinux_login_file(const char *username, char *string);
static errno_t remove_selinux_login_file(const char *username);
/* Choose best selinux user based on given order and write
* the user to selinux login file. */
static errno_t choose_best_seuser(struct sysdb_attrs **usermaps,
struct pam_data *pd,
char **order_array, int order_count,
const char *default_user)
{
TALLOC_CTX *tmp_ctx;
char *file_content = NULL;
const char *tmp_str;
errno_t ret, err;
int i, j;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
return ENOMEM;
}
/* If no maps match, we'll use the default SELinux user from the
* config */
file_content = talloc_strdup(tmp_ctx, default_user);
if (file_content == NULL) {
ret = ENOMEM;
goto done;
}
/* Iterate through the order array and try to find SELinux users
* in fetched maps. The order array contains all SELinux users
* allowed in the domain in the same order they should appear
* in the SELinux config file. If any user from the order array
* is not in fetched user maps, it means it should not be allowed
* for the user who is just logging in.
*
* Right now we have empty content of the SELinux config file,
* we shall add only those SELinux users that are present both in
* the order array and user maps applicable to the user who is
* logging in.
*/
for (i = 0; i < order_count; i++) {
for (j = 0; usermaps[j] != NULL; j++) {
tmp_str = sss_selinux_map_get_seuser(usermaps[j]);
if (tmp_str && !strcasecmp(tmp_str, order_array[i])) {
/* If file_content contained something, overwrite it.
* This record has higher priority.
*/
talloc_zfree(file_content);
file_content = talloc_strdup(tmp_ctx, tmp_str);
if (file_content == NULL) {
ret = ENOMEM;
goto done;
}
break;
}
}
}
ret = write_selinux_login_file(pd->user, file_content);
done:
if (!file_content) {
err = remove_selinux_login_file(pd->user);
/* Don't overwrite original error condition if there was one */
if (ret == EOK) ret = err;
}
talloc_free(tmp_ctx);
return ret;
}
static errno_t write_selinux_login_file(const char *username, char *string)
{
char *path = NULL;
char *tmp_path = NULL;
ssize_t written;
size_t len;
int fd = -1;
mode_t oldmask;
TALLOC_CTX *tmp_ctx;
char *full_string = NULL;
int enforce;
errno_t ret = EOK;
len = strlen(string);
if (len == 0) {
return EINVAL;
}
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
return ENOMEM;
}
path = selogin_path(tmp_ctx, username);
if (path == NULL) {
ret = ENOMEM;
goto done;
}
tmp_path = talloc_asprintf(tmp_ctx, "%sXXXXXX", path);
if (tmp_path == NULL) {
ret = ENOMEM;
goto done;
}
oldmask = umask(022);
fd = mkstemp(tmp_path);
ret = errno;
umask(oldmask);
if (fd < 0) {
if (ret == ENOENT) {
/* if selinux is disabled and selogin dir does not exist,
* just ignore the error */
if (selinux_getenforcemode(&enforce) == 0 && enforce == -1) {
ret = EOK;
goto done;
}
/* continue if we can't get enforce mode or selinux is enabled */
}
DEBUG(SSSDBG_OP_FAILURE, ("unable to create temp file [%s] "
"for SELinux data [%d]: %s\n", tmp_path, ret, strerror(ret)));
goto done;
}
full_string = talloc_asprintf(tmp_ctx, "%s:%s", ALL_SERVICES, string);
if (full_string == NULL) {
ret = ENOMEM;
goto done;
}
len = strlen(full_string);
errno = 0;
written = sss_atomic_write_s(fd, full_string, len);
if (written == -1) {
ret = errno;
DEBUG(SSSDBG_OP_FAILURE, ("writing to SELinux data file %s"
"failed [%d]: %s", tmp_path, ret,
strerror(ret)));
goto done;
}
if (written != len) {
DEBUG(SSSDBG_OP_FAILURE, ("Expected to write %zd bytes, wrote %zu",
written, len));
ret = EIO;
goto done;
}
errno = 0;
if (rename(tmp_path, path) < 0) {
ret = errno;
} else {
ret = EOK;
}
close(fd);
fd = -1;
done:
if (fd != -1) {
close(fd);
if (unlink(tmp_path) < 0) {
DEBUG(SSSDBG_MINOR_FAILURE, ("Could not remove file [%s]",
tmp_path));
}
}
talloc_free(tmp_ctx);
return ret;
}
static errno_t remove_selinux_login_file(const char *username)
{
char *path;
errno_t ret;
path = selogin_path(NULL, username);
if (!path) return ENOMEM;
errno = 0;
ret = unlink(path);
if (ret < 0) {
ret = errno;
if (ret == ENOENT) {
/* Just return success if the file was not there */
ret = EOK;
} else {
DEBUG(SSSDBG_OP_FAILURE,
("Could not remove login file %s [%d]: %s\n",
path, ret, strerror(ret)));
}
}
talloc_free(path);
return ret;
}
/* A more generic request to gather all SELinux and HBAC rules. Updates
* cache if necessary
*/
struct ipa_get_selinux_state {
struct be_ctx *be_ctx;
struct ipa_selinux_ctx *selinux_ctx;
struct sdap_id_op *op;
struct sysdb_attrs *host;
struct sysdb_attrs *user;
struct sysdb_attrs *defaults;
struct sysdb_attrs **selinuxmaps;
size_t nmaps;
struct sysdb_attrs **hbac_rules;
size_t hbac_rule_count;
};
static errno_t
ipa_get_selinux_maps_offline(struct tevent_req *req);
static struct tevent_req *
ipa_get_selinux_send(TALLOC_CTX *mem_ctx,
struct be_ctx *be_ctx,
struct sysdb_attrs *user,
struct sysdb_attrs *host,
struct ipa_selinux_ctx *selinux_ctx)
{
struct tevent_req *req;
struct tevent_req *subreq;
struct ipa_get_selinux_state *state;
bool offline;
int ret = EOK;
time_t now;
time_t refresh_interval;
struct ipa_options *ipa_options = selinux_ctx->id_ctx->ipa_options;
DEBUG(SSSDBG_TRACE_FUNC, ("Retrieving SELinux user mapping\n"));
req = tevent_req_create(mem_ctx, &state, struct ipa_get_selinux_state);
if (req == NULL) {
return NULL;
}
state->be_ctx = be_ctx;
state->selinux_ctx = selinux_ctx;
state->user = user;
state->host = host;
offline = be_is_offline(be_ctx);
DEBUG(SSSDBG_TRACE_INTERNAL, ("Connection status is [%s].\n",
offline ? "offline" : "online"));
if (!offline) {
refresh_interval = dp_opt_get_int(ipa_options->basic,
IPA_SELINUX_REFRESH);
now = time(NULL);
if (now < selinux_ctx->last_update + refresh_interval) {
/* SELinux maps were recently updated -> force offline */
DEBUG(SSSDBG_TRACE_INTERNAL,
("Performing cached SELinux processing\n"));
offline = true;
}
}
if (!offline) {
state->op = sdap_id_op_create(state,
selinux_ctx->id_ctx->sdap_id_ctx->conn->conn_cache);
if (!state->op) {
DEBUG(SSSDBG_OP_FAILURE, ("sdap_id_op_create failed\n"));
ret = ENOMEM;
goto immediate;
}
subreq = sdap_id_op_connect_send(state->op, state, &ret);
if (!subreq) {
DEBUG(SSSDBG_CRIT_FAILURE, ("sdap_id_op_connect_send failed: "
"%d(%s).\n", ret, strerror(ret)));
talloc_zfree(state->op);
goto immediate;
}
tevent_req_set_callback(subreq, ipa_get_selinux_connect_done, req);
} else {
ret = ipa_get_selinux_maps_offline(req);
goto immediate;
}
return req;
immediate:
if (ret == EOK) {
tevent_req_done(req);
} else {
tevent_req_error(req, ret);
}
tevent_req_post(req, be_ctx->ev);
return req;
}
static void ipa_get_selinux_connect_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(subreq,
struct tevent_req);
struct ipa_get_selinux_state *state = tevent_req_data(req,
struct ipa_get_selinux_state);
int dp_error = DP_ERR_FATAL;
int ret;
struct ipa_id_ctx *id_ctx = state->selinux_ctx->id_ctx;
const char *access_name;
const char *selinux_name;
const char *hostname;
ret = sdap_id_op_connect_recv(subreq, &dp_error);
talloc_zfree(subreq);
if (dp_error == DP_ERR_OFFLINE) {
talloc_zfree(state->op);
ret = ipa_get_selinux_maps_offline(req);
if (ret == EOK) {
tevent_req_done(req);
return;
}
goto fail;
}
if (ret != EOK) {
goto fail;
}
access_name = state->be_ctx->bet_info[BET_ACCESS].mod_name;
selinux_name = state->be_ctx->bet_info[BET_SELINUX].mod_name;
if (strcasecmp(access_name, selinux_name) == 0 && state->host != NULL) {
/* If the access control module is the same as the selinux module
* and the access control had already discovered the host
*/
return ipa_get_config_step(req);
}
hostname = dp_opt_get_string(state->selinux_ctx->id_ctx->ipa_options->basic,
IPA_HOSTNAME);
if (hostname == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Cannot determine the host name\n"));
goto fail;
}
subreq = ipa_host_info_send(state, state->be_ctx->ev,
sdap_id_op_handle(state->op),
id_ctx->sdap_id_ctx->opts,
hostname,
id_ctx->ipa_options->host_map,
NULL,
state->selinux_ctx->host_search_bases);
if (subreq == NULL) {
ret = ENOMEM;
goto fail;
}
tevent_req_set_callback(subreq, ipa_get_selinux_hosts_done, req);
return;
fail:
tevent_req_error(req, ret);
}
static errno_t
ipa_get_selinux_maps_offline(struct tevent_req *req)
{
errno_t ret;
size_t nmaps;
struct ldb_message **maps;
struct ldb_message *defaults;
const char *attrs[] = { SYSDB_NAME,
SYSDB_USER_CATEGORY,
SYSDB_HOST_CATEGORY,
SYSDB_ORIG_MEMBER_USER,
SYSDB_ORIG_MEMBER_HOST,
SYSDB_SELINUX_SEEALSO,
SYSDB_SELINUX_USER,
NULL };
const char *default_user;
const char *order;
struct ipa_get_selinux_state *state = tevent_req_data(req,
struct ipa_get_selinux_state);
/* read the config entry */
ret = sysdb_search_selinux_config(state, state->be_ctx->domain->sysdb,
state->be_ctx->domain, NULL, &defaults);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("sysdb_search_selinux_config failed [%d]: %s\n",
ret, strerror(ret)));
return ret;
}
default_user = ldb_msg_find_attr_as_string(defaults,
SYSDB_SELINUX_DEFAULT_USER,
NULL);
order = ldb_msg_find_attr_as_string(defaults, SYSDB_SELINUX_DEFAULT_ORDER,
NULL);
state->defaults = sysdb_new_attrs(state);
if (state->defaults == NULL) {
return ENOMEM;
}
ret = sysdb_attrs_add_string(state->defaults,
IPA_CONFIG_SELINUX_DEFAULT_USER_CTX,
default_user);
if (ret != EOK) {
return ret;
}
ret = sysdb_attrs_add_string(state->defaults,
IPA_CONFIG_SELINUX_MAP_ORDER, order);
if (ret != EOK) {
return ret;
}
/* read all the SELinux rules */
ret = sysdb_get_selinux_usermaps(state, state->be_ctx->domain->sysdb,
state->be_ctx->domain,
attrs, &nmaps, &maps);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("sysdb_get_selinux_usermaps failed [%d]: %s\n",
ret, strerror(ret)));
return ret;
}
ret = sysdb_msg2attrs(state, nmaps, maps, &state->selinuxmaps);
if (ret != EOK) {
return ret;
}
state->nmaps = nmaps;
/* read all the HBAC rules */
ret = hbac_get_cached_rules(state, state->be_ctx->domain,
&state->hbac_rule_count, &state->hbac_rules);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("hbac_get_cached_rules failed [%d]: %s\n",
ret, strerror(ret)));
return ret;
}
return EOK;
}
static void ipa_get_selinux_hosts_done(struct tevent_req *subreq)
{
errno_t ret;
struct tevent_req *req = tevent_req_callback_data(subreq,
struct tevent_req);
struct ipa_get_selinux_state *state = tevent_req_data(req,
struct ipa_get_selinux_state);
size_t host_count, hostgroup_count;
struct sysdb_attrs **hostgroups;
struct sysdb_attrs **host;
ret = ipa_host_info_recv(subreq, state, &host_count, &host,
&hostgroup_count, &hostgroups);
talloc_free(subreq);
if (ret != EOK) {
goto done;
}
state->host = host[0];
return ipa_get_config_step(req);
done:
if (ret != EOK) {
tevent_req_error(req, ret);
}
}
static void ipa_get_config_step(struct tevent_req *req)
{
const char *domain;
struct tevent_req *subreq;
struct ipa_get_selinux_state *state = tevent_req_data(req,
struct ipa_get_selinux_state);
struct ipa_id_ctx *id_ctx = state->selinux_ctx->id_ctx;
domain = dp_opt_get_string(state->selinux_ctx->id_ctx->ipa_options->basic,
IPA_KRB5_REALM);
subreq = ipa_get_config_send(state, state->be_ctx->ev,
sdap_id_op_handle(state->op),
id_ctx->sdap_id_ctx->opts,
domain, NULL);
if (subreq == NULL) {
tevent_req_error(req, ENOMEM);
}
tevent_req_set_callback(subreq, ipa_get_selinux_config_done, req);
}
static void ipa_get_selinux_config_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(subreq,
struct tevent_req);
struct ipa_get_selinux_state *state = tevent_req_data(req,
struct ipa_get_selinux_state);
struct sdap_id_ctx *id_ctx = state->selinux_ctx->id_ctx->sdap_id_ctx;
errno_t ret;
ret = ipa_get_config_recv(subreq, state, &state->defaults);
talloc_free(subreq);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("Could not get IPA config\n"));
goto done;
}
subreq = ipa_selinux_get_maps_send(state, state->be_ctx->ev,
state->be_ctx->domain->sysdb,
sdap_id_op_handle(state->op),
id_ctx->opts,
state->selinux_ctx->id_ctx->ipa_options,
state->selinux_ctx->selinux_search_bases);
if (!subreq) {
ret = ENOMEM;
goto done;
}
tevent_req_set_callback(subreq, ipa_get_selinux_maps_done, req);
return;
done:
if (ret != EOK) {
tevent_req_error(req, ret);
} else {
tevent_req_done(req);
}
}
static void ipa_get_selinux_maps_done(struct tevent_req *subreq)
{
struct tevent_req *req;
struct ipa_get_selinux_state *state;
struct ipa_id_ctx *id_ctx;
char *selinux_name;
char *access_name;
const char *tmp_str;
bool check_hbac;
errno_t ret;
int i;
req = tevent_req_callback_data(subreq, struct tevent_req);
state = tevent_req_data(req, struct ipa_get_selinux_state);
id_ctx = state->selinux_ctx->id_ctx;
ret = ipa_selinux_get_maps_recv(subreq, state,
&state->nmaps, &state->selinuxmaps);
talloc_free(subreq);
if (ret != EOK) {
if (ret == ENOENT) {
/* This is returned if no SELinux mapping
* rules were found. In that case no error
* occurred, but we don't want any more processing.*/
ret = EOK;
}
goto done;
}
DEBUG(SSSDBG_TRACE_FUNC,
("Found %zu SELinux user maps\n", state->nmaps));
check_hbac = false;
for (i = 0; i < state->nmaps; i++) {
ret = sysdb_attrs_get_string(state->selinuxmaps[i],
SYSDB_SELINUX_SEEALSO, &tmp_str);
if (ret == EOK) {
check_hbac = true;
break;
}
}
if (check_hbac) {
access_name = state->be_ctx->bet_info[BET_ACCESS].mod_name;
selinux_name = state->be_ctx->bet_info[BET_SELINUX].mod_name;
if (strcasecmp(access_name, selinux_name) == 0) {
ret = hbac_get_cached_rules(state, state->be_ctx->domain,
&state->hbac_rule_count,
&state->hbac_rules);
/* Terminates the request */
goto done;
}
DEBUG(SSSDBG_TRACE_FUNC, ("SELinux maps referenced an HBAC rule. "
"Need to refresh HBAC rules\n"));
subreq = ipa_hbac_rule_info_send(state, false, state->be_ctx->ev,
sdap_id_op_handle(state->op),
id_ctx->sdap_id_ctx->opts,
state->selinux_ctx->hbac_search_bases,
state->host);
if (subreq == NULL) {
ret = ENOMEM;
goto done;
}
tevent_req_set_callback(subreq, ipa_get_selinux_hbac_done, req);
return;
}
ret = EOK;
done:
if (ret == EOK) {
tevent_req_done(req);
} else {
tevent_req_error(req, ret);
}
}
static void ipa_get_selinux_hbac_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(subreq,
struct tevent_req);
struct ipa_get_selinux_state *state = tevent_req_data(req,
struct ipa_get_selinux_state);
errno_t ret;
ret = ipa_hbac_rule_info_recv(subreq, state, &state->hbac_rule_count,
&state->hbac_rules);
DEBUG(SSSDBG_TRACE_INTERNAL,
("Received %zu HBAC rules\n", state->hbac_rule_count));
talloc_free(subreq);
if (ret != EOK) {
tevent_req_error(req, ret);
} else {
tevent_req_done(req);
}
}
static errno_t
ipa_get_selinux_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
size_t *count,
struct sysdb_attrs ***maps,
size_t *hbac_count,
struct sysdb_attrs ***hbac_rules,
char **default_user,
char **map_order)
{
struct ipa_get_selinux_state *state =
tevent_req_data(req, struct ipa_get_selinux_state);
const char *tmp_str;
errno_t ret;
TEVENT_REQ_RETURN_ON_ERROR(req);
if (state->defaults != NULL) {
ret = sysdb_attrs_get_string(state->defaults,
IPA_CONFIG_SELINUX_DEFAULT_USER_CTX,
&tmp_str);
if (ret != EOK && ret != ENOENT) {
return ret;
}
if (ret == EOK) {
*default_user = talloc_strdup(mem_ctx, tmp_str);
if (*default_user == NULL) {
return ENOMEM;
}
}
ret = sysdb_attrs_get_string(state->defaults, IPA_CONFIG_SELINUX_MAP_ORDER,
&tmp_str);
if (ret != EOK) {
return ret;
}
*map_order = talloc_strdup(mem_ctx, tmp_str);
if (*map_order == NULL) {
talloc_zfree(*default_user);
return ENOMEM;
}
} else {
*map_order = NULL;
*default_user = NULL;
}
if (state->selinuxmaps != NULL) {
*count = state->nmaps;
*maps = talloc_steal(mem_ctx, state->selinuxmaps);
} else {
*count = 0;
*maps = NULL;
}
if (state->hbac_rules != NULL) {
*hbac_count = state->hbac_rule_count;
*hbac_rules = talloc_steal(mem_ctx, state->hbac_rules);
} else {
*hbac_count = 0;
*hbac_rules = NULL;
}
return EOK;
}
/*end of #if defined HAVE_SELINUX && defined HAVE_SELINUX_LOGIN_DIR */
#else
/* Simply return success if HAVE_SELINUX_LOGIN_DIR is not defined. */
void ipa_selinux_handler(struct be_req *be_req)
{
struct pam_data *pd;
pd = talloc_get_type(be_req_get_data(be_req), struct pam_data);
pd->pam_status = PAM_SUCCESS;
be_req_terminate(be_req, DP_ERR_OK, EOK, "Success");
}
#endif
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